Feat/error logs (#16)

* added list of tasks to achieve

* update deps

* update elixir version in CI/CD pipeline

* update todo with branch push checks

* underscores separation of large numbers

* update elixir version and deps

* add basic module  docs

* remove IO.inspect call

* check if list is empty rather than traversing list for length

* revert empty list code

* duration tests

* add mime type tests

* use logger instread of inspect, remove todos

* replace list length check with Enum.empty

* replace list length check with !Enum.empty?

* numbers readability fix by using underscores on large numbers

* iucn parser replaced case with multiclause function and added test

* replace map and join with map_join

* fix multiple spec issues where map() must be inside a list

lib/metrics/message.ex

@@ -1,4 +1,7 @@
 defmodule PlantIdDiscordBot.Metrics.Message do
+  @moduledoc """
+  Metrics messaging.
+  """
   def send() do
     PlantIdDiscordBot.Metrics.requests()
     |> format_message()

lib/metrics/requests.ex

@@ -1,4 +1,7 @@
 defmodule PlantIdDiscordBot.Metrics.Requests do
+  @moduledoc """
+  Basic metrics with usage count per guild.
+  """
   use Agent
   alias PlantIdDiscordBot.Metrics.Requests
   alias PlantIdDiscordBot.ProcessRegistry